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721 Letters DISCUSSION Cavernoma is a benign tumor and it is considered a dysplasia of the vessels-forming mesoderm 4. Cavernous hemangiomas in the vertebral, extradural, intradural ex-tramedullary and intramedullary spaces are responsible for 3 to 16% of spinal vascular anomalies 4,5. Extradural cavernous hemangioma represent 4% of all spinal epidural… (More)